Improvement in processes for making strengthening-rings for cannon



1. F. ALLEN.

Processes for Making Strengthening-Rings for Cannon.

N0. 53,294. v Paiented luly 21,1874.

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Unrrnb STATES ATEN'I. OFFICE.

JOHN F. ALLEN, OF NEW YORK, N. Y.

IMPROVEMENT IN PROCESSES FOR MAKING STRENGTHENING-RINGS FOR CANNON.

Specification forming part of Letters Patent N0.153,294, dated July 21,1874; application filed January 6, 1874.

To all whom it may concern:

Be it known that I, JOHN F. ALLEN, of New York, in the State of NewYork, have invented a new and Improved Mode of Strengthening (lannonsand other cylinders, of which the following is a specification:

The nature of my invention consists in forging, rolling, or casting thinmetallic rings or plates, either conical or with radiating corrugations, and then pressing these rings or plates straight when cold, sothat the strain arising from any pressure, acting against the innercircumference, will be more equally distributed between the inner andouter circumfercncc.

In the accompanying drawing, Figure I represents a section of a cannonstrengthened by rings made in accordance with my improved mode. 7 tionsand plans of the rings or plates referred to in the specification.

A represents the central core of the gun turned cylindrical on its afterpart B and increased in thickness at its forward end to any desiredstrength, and forming a collar at C for the strengthening plates to abutagainst. Upon the after cylindrical part B, where it is desired tostrengthen the gun, steel plates or disks 1) are forced by hydraulic orother pressure, which said disks or plates are securely kept in place bya ring, E. The disks or plates 1), and which form the principal part ofmy invention, are rolled, cast, or forged in the shape of conical disks,as represented in section in Fig. II, or the same may be corrugated, asrepresented in section and plan in Figs. Ill and V, the corrugationsbeing largest at the central hole, and radiating and graduallydiminishing in size toward the outer circuintereucc of the disk. Theserings or plates are made with a central hole about as large as the outerdiameter of the turned part B of the gun, and not more than one-half orthreequarters of an inch in thickness. When these rings or plates arecold they are, by means of pressure, forced into straight flat rings orplates of an even thickness. The central hole in each plate is thenbored out the proper size Figs. II, 111, IV, and V represent sec-' andforced upon the cylindrical turned part B perfectly tight against eachother, and then securely locked in their places by means of the ring E.In the inner circumference of the ring E grooves 01. n are turned, andcorresponding grooves m m are turned in the after part of thecircumference of the part B. Into these grooves m m rings J J, similarto pistonpacking rings, are sprung and then compressed to allow the ringE to pass over the same until said ring E has been forced on so far thatthe grooves n n in its inner surface correspond exactly with the groovesm m containing the spring-rings J J when these latter will expand andenter said grooves n n in the ring E, as represented in the drawing, andthereby hold said ring E perfectly secure in its place. When all therings or plates D, and ring E, are in their places and firmly fastened,the outside of the cylinder or cannon can be turned in the usual mannerin any desired shape. When this mode of strengthenin g is used forcannons, the disks or plates D, which are situated in the line of thetrunnions, can be forged with projections on the outer circumference,from which the trunnions F can be turned, and afterward covered by asteel cap or ring, w, to obtain a smooth bearing.

I do not claim strengthening cylinders or cannons by forcing orshrinking steel rings on their outer circumference, as this is old andwell known; but

What I claim as my invention, and desire to secure by Letters Patent,is-

The herein-described mode of strengthening thin metallic rings, whenintended for strengthening cannons or cylinders, by either forging,rolling, or casting them conical, diskshaped, or with radialcorrugations gradually diminishing to ward th eir. outer circumference,and then pressing the same straight and fiat while in acold state,substantially as set forth.

JOHN F. ALLEN.

itnesscs:

HENRY E. RoEDEn, J. B. Nouns.

